Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...2e..40a&link_type=abstract
On the Present and Future of Pulsar Astronomy, 26th meeting of the IAU, Joint Discussion 2, 16-17 August, 2006, Prague, Czech Re
Astronomy and Astrophysics
Astronomy
Scientific paper
In general, the single-photon reaction γ → e^- + e^+, as well as the inverse reaction of the electron-positron annihilation can proceed in a medium that must be a plasmalike. To provide a macroscopic refractive index n(ω)<1 at necessary for pair production γ-frequencies one needs plasma densities ρ > 10^ 33 cm^-3. Such superdense matter exists in the core of the neutron stars - pulsars. At these densities the electron component of the superdense plasma is fully degenerate and taking also into account the Pauli principle the probabilities of these processes actually turn to zero [1]. Hence, here we consider the possibility of multiphoton electron-positron pair production by strong electromagnetic radiation of soft frequencies in magnetosphere of pulsars [2], which is possible at ordinary densities of plasma [3]. Such multiphoton process occurs via nonlinear channels at high intensities of electromagnetic radiation in wide region of frequencies from radio to UV and soft X-ray in pulsars' magnetosphere. Numerical simulations for various pulsars (Ω~1÷200 s^-1) with the help of analytical distribution functions of magnetosphere's plasma with densities ρ~10^20÷10^22 cm^-3 [2] and pair production probabilities [3] have been made, and both energetic and angular distributions of produced electron-positron pairs are presented. References [1] H.K. Avetissian, A.K. Avetissian, Kh.V. Sedrakian, Zh. Éksp. Teor. Fiz. 94, 21 (1988) [Sov. Phys. JETP 67, 660 1988]. [2] A.K. Avetissian, Astrofizika 15, 135 (1979) [Sov. Phys. Astrophysics 16, 285 1980]. [3] H. K. Avetissian et al., Phys. Rev. D 54, 5509 (1996).
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